The Eiffel Tower went dark on Monday night in tribute to the victims of the attacks in Las Vegas and Marseille.

At least 59 people were killed and hundreds wounded Sunday when a gunman opened fire on a concert in Las Vegas in the deadliest mass shooting in modern US history.

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Earlier Sunday, a man knifed two young women to death outside the main train station in Marseille, France’s second-biggest city.

The Islamic State group claimed responsibility for both attacks via the jihadists’ propaganda outlet Amaq, which said they were carried out by its “soldiers.” It did not provide any evidence for either claim.

“Tonight we will turn off the Eiffel Tower from midnight in homage to the victims of the attacks in Marseille and Las Vegas,” Paris mayor Anne Hidalgo wrote, adding the hashtag “we are united.”

The French capital has repeatedly switched off the nighttime lights on its most famous landmark to show solidarity with victims of terror attacks from London to Kabul.

Meanwhile, the motive behind the deadliest mass shooting in modern US history remained a mystery Monday as police sought to learn more about the apparent “lone wolf” gunman who opened fire on thousands of concertgoers from the 32nd floor of a Las Vegas hotel.

In a latest count, at least 59 people were killed and hundreds more were injured in the shooting, which happened during a performance by country music star Jason Aldean Sunday night at the Route 91 Harvest Festival. The gunman hammered out a window at the Mandalay Bay Hotel and Casino and began firing with a cache of weapons. Authorities who stormed the suspect’s room found that he had killed himself.

Authorities are discounting the possibility that international terror organizations were involved in the shooting, despite a claim of responsibility by the Islamic State group.

The suspected gunman, Stephen Craig Paddock, a 64-year-old retiree from Mesquite, Nevada, wasn’t on the radar of law enforcement. They think he acted alone but want to talk with his 62-year-old roommate.

“I can’t get into the mind of a psychopath at this point,” Sheriff Joseph Lombardo said.

Two officials familiar with the investigation say authorities found at least 17 guns in Paddock’s hotel room.